Hi coders, Since 3 months i'm on codeforces, not so long when i see that some of you are here for more than 5 years, like vjudges vjudge1 vjudge2 vjudge3 vjudge4 vjudge5.

I saw that they are the ones who submit more problems on problemset standings. So i'm curious who are vjudges? what are their roles on codeforces? are they admins or ...?